Handheld multi-mode electric pick and control system thereof

Abstract

The invention discloses a handheld multi-mode electric pick and a control system thereof, and relates to the technical field of electric tools. According to the scheme, the containing box used for containing the motor is arranged in the shell, and the flow guide pipe communicating with the air supply cavity and the external environment is arranged in the containing box; when the temperature of the motor is at a low level, the airflow circularly flows through the flow guide pipe and cools the motor in a sealed environment; when the temperature of the motor rises, the sealing piece is driven to move from the folding position to the unfolding position, so that airflow passes through the driving shaft and directly cools the internal area of the motor, and the cooling efficiency is improved; when the temperature of the motor rises to a preset limit, the adjusting window is controlled to be opened, so that cold airflow flows through the motor to directly dissipate heat of the motor, and the cooling efficiency of the motor is further improved; according to the scheme, different cooling modes are correspondingly adopted according to different temperatures of the motor, so that high-efficiency cooling of the motor is realized under the condition that dust invading into the motor is reduced as much as possible.

Description

Technical Field

[0001] The present invention relates to the technical field of electric tools, and in particular to a handheld multi-mode electric pick and a control system thereof. Background Art

[0002] With the continuous development of power tool technology, the functionality and efficiency of electric picks, a power tool widely used in construction, decoration and other fields, have been significantly improved. In order to meet the needs of different work scenarios, modern electric pick products are gradually developing in a multifunctional direction, integrating multiple functions such as electric hammers and electric drills. This design greatly improves the versatility and convenience of the tool. Users can quickly switch working modes according to actual needs without carrying multiple tools.

[0003] During the operation of the electric pick, the motor is its core power component, and its performance directly determines the working efficiency and reliability of the electric pick. At present, the motor in the electric pick is usually cooled and dissipated by direct air cooling. Due to the harsh working environment of the electric pick, such as the demolition of hard materials such as cement and concrete, there is a lot of dust in the surrounding air, which leads to a lot of dust intrusion into the rotor and stator over time. The presence of dust forms a heat insulation layer, which reduces the heat conduction efficiency and increases the thermal resistance (increases the resistance to heat transfer from the heat source to the surrounding environment), which can easily cause the internal temperature of the motor to rise and produce high temperature overheating.

[0004] In addition, the multi-mode working characteristics of the electric pick also exacerbate the problem of high temperature generated by the motor. The operation of the electric pick in multiple modes means that the electric pick needs to switch from one mode to another mode to continue working, which causes the electric pick to often need to work for a long time and continuously, further exacerbating the situation of high temperature generated by the motor. The heat dissipation demand of the motor has increased significantly, and the traditional air cooling method is difficult to meet this demand. Especially in the process of multi-mode switching, the load and speed of the motor may change suddenly, further exacerbating the thermal load of the motor, making the motor more prone to overheating, causing the electric pick to often stop working automatically due to excessive motor temperature, which will affect the progress of the work and reduce the service life of the motor.

[0005] Therefore, how to develop an electric pick motor heat dissipation system that can both effectively dissipate heat and prevent dust intrusion has become a technical problem that needs to be urgently solved in the field of electric pick technology. Summary of the invention

[0006] The purpose of the present invention is to provide a handheld multi-mode electric pick and its control system, aiming to improve the problem that dust intrusion into the motor of the electric pick during operation reduces the heat dissipation efficiency of the motor and frequently causes high temperature overheating.

[0007] To achieve the above object, in a first aspect, an embodiment of the present application provides a handheld multi-mode electric pickaxe, including a motor, a transmission assembly, and an impact assembly. The handheld multi-mode electric pickaxe has a hammering mode and a hammer-drilling mode, and includes:

[0008] A housing, in which the motor, the transmission assembly, and the impact assembly are all accommodated;

[0009] A receiving box is provided in the housing, and the motor is accommodated in the receiving box. In the radial direction of the motor, there is a gap between the outer periphery of the motor and the inner side wall of the receiving box, so that a first space is formed between the two;

[0010] A blade is coaxially sleeved and fixed on the driving shaft of the motor. The blade is spaced above the receiving box, so that a air supply cavity is formed between the blade and the receiving box;

[0011] A plurality of guide pipes are provided in the first space. The plurality of guide pipes are axially spaced around the driving shaft and distributed in the first space; in the axial direction of the motor, one end of each guide pipe communicates with the air supply cavity and the other end communicates with the outside;

[0012] A plurality of adjustment windows are provided. The plurality of adjustment windows are axially spaced around the driving shaft and distributed on the circumferential side wall of the receiving box; the adjustment window has an open position and a closed position. When the adjustment window is in the open position, the first space communicates with the outside and the air supply cavity; when the adjustment window is in the closed position, it is used to seal the receiving box; and

[0013] An air outlet is provided on the side wall of the housing, and the air outlet is located above the blade.

[0014] In an embodiment, the receiving box includes a top plate, and the driving shaft passes through the top plate from bottom to top; and

[0015] A side plate, in the axial direction of the motor, one end of the side plate is connected to the bottom wall of the top plate and the other end is fixedly abutted against the bottom wall of the housing.

[0016] In an embodiment, the top plate includes a first sub-plate body, and the first sub-plate body is coaxially sleeved and fixed on the driving shaft; the upper ends of the guide pipes are all connected to the first sub-plate body; and

[0017] A second sub-plate body, coaxially arranged outside the first sub-plate body. One end of the second sub-plate body away from the first sub-plate body is fixedly connected to the side plate, and one end of the second sub-plate body close to the first sub-plate body is rotatably connected to the periphery of the first sub-plate body;

[0018] The receiving box further includes a swivel ring which is rotatably arranged coaxially on the bottom wall of the housing. In the axial direction of the motor, the swivel ring penetrates through the bottom wall of the housing, and the lower ends of the flow guide pipes are all connected to the swivel ring; a plurality of first air outlet holes are penetrated through the swivel ring.

[0019] The adjustment window is arranged on the second sub-board body and / or the side board.

[0020] In one embodiment, the adjustment window includes a first hole arranged on the side board. In the radial direction of the motor, the first hole penetrates through the side board, and in the axial direction of the motor, the first hole penetrates through the side board; and

[0021] a second hole arranged on the second sub-board body. In the radial direction of the motor, the second hole penetrates through the outer peripheral side of the second sub-board body, and in the axial direction of the motor, the second hole penetrates through the second sub-board body; in the radial direction of the motor, the first hole and the second hole are in corresponding positions and form a first adjustment hole.

[0022] An adjustment plate is movably connected to the receiving box along the circumferential direction of the receiving box. The adjustment plate has an open position and a closed position. The adjustment plate is received in the side board and the second sub-board body, so that the adjustment plate is in the open position and the first adjustment hole is opened; the adjustment plate is located at the adjustment hole, so that the adjustment plate is in the closed position and the first adjustment hole is sealed.

[0023] In one embodiment, in the radial direction of the motor, the peripheral side of the sealing box is spaced from the inner wall of the housing, so that a second space communicating with the air supply chamber is formed at an interval between the peripheral side of the sealing box and the inner wall of the housing;

[0024] On the bottom wall of the housing corresponding to the second space in the axial direction of the motor, a plurality of second air outlet holes are provided.

[0025] In one embodiment, one end of the drive shaft away from the blade extends downward out of the housing.

[0026] The periphery of the drive shaft located in the air supply chamber has a plurality of openings, and the plurality of openings are arranged at intervals around the axial direction of the motor; a flow channel corresponding to the openings is arranged in the drive shaft, and the flow channel extends along the axial direction of the motor;

[0027] In the axial direction of the motor, the upper end of the flow channel communicates with the opening, and the lower end of the flow channel penetrates downward through the drive shaft.

[0028] In one embodiment, the handheld multi-mode electric pick also includes a sealing member movably arranged in the opening. The sealing member has an unfolded position and a folded position;

[0029] When the seal is in the deployed position, the opening is opened to introduce air flow into the opening and into the flow channel; when the seal is in the retracted position, it is used to seal the opening; when the seal is in the retracted position, the outer peripheral contour of the seal matches the outer peripheral contour of the drive shaft.

[0030] In one embodiment, the handheld multi-mode electric pickaxe further includes a drive rod coaxially disposed within the drive shaft. At least a part of the lower end of the drive rod extends out of the drive shaft, and the lower end of the drive rod is threadedly connected to the housing; and

[0031] a bearing, the inner ring of the bearing is fixed around the outer periphery of the drive rod;

[0032] a connecting rod, radially of the motor, one end of the connecting rod is rotatably mounted on the outer ring of the bearing and the other end is rotatably mounted on the seal; rotating the drive rod drives the seal to move between the deployed position and the retracted position.

[0033] In one embodiment, a duct is coaxially provided within the drive shaft, the drive rod is movably disposed within the duct, and the drive rod is a metal structural member;

[0034] The drive rod has a lumen, and a liquid absorption core is attached to the inner wall of the lumen. The liquid absorption core stores a low-boiling liquid; an air duct is formed on a side of the liquid absorption core away from the inner wall of the lumen, and the lumen is in a vacuum environment;

[0035] A heat exchange port communicating with the duct is provided on the circumferential side of the drive shaft above the opening. Axially of the motor, the heat exchange port is offset from the opening.

[0036] In a second aspect, an embodiment of the present application provides a control system that uses the handheld multi-mode electric pickaxe in the above embodiment, including a temperature sensor disposed within the motor for collecting temperature information of the motor;

[0037] a driving member for driving the regulating plate to move between the open position and the closed position;

[0038] a central controller electrically connected to the temperature sensor and the driving member. The central controller receives the motor temperature information and controls the driving member to drive the regulating plate to move between the open position and the closed position.

[0039] Compared with the prior art, an embodiment of the present invention provides a handheld multi-mode electric pickaxe and its control system, and the beneficial effects are as follows: In this solution, a receiving box for placing the motor is provided inside the housing, and a diversion pipe communicating with the air supply cavity and the external environment is provided inside the receiving box; when the temperature of the motor is at a relatively low level, a sealed environment is formed inside the receiving box, and the air flow circulates through the diversion pipe to cool the motor in the sealed environment; since the air flow does not contact the motor, dust mixed in the air flow is prevented from invading the motor; when the temperature of the motor rises, the seal is driven to move from the retracted position to the deployed position, so that the air flow passes through the drive shaft and directly cools the core area inside the motor, thereby accelerating the cooling efficiency; so that when the temperature of the motor rises to the preset limit level, the control adjustment window is opened, so that the cold air flow directly passes through the motor to directly dissipate heat from the motor, so as to further improve the cooling efficiency of the motor; this solution adopts different cooling methods corresponding to the change of the motor temperature, so as to achieve efficient cooling and cooling of the motor while minimizing the invasion of dust into the motor, and avoid the situation of frequent high temperature and overheating of the motor resulting in shutdown. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 FIG. 1 is a schematic diagram of the overall structure of an electric pickaxe according to an embodiment of the present invention;

[0041] Figure 2 For the present invention Figure 1 exploded schematic diagram of the electric pickaxe structure;

[0042] Figure 3 FIG. 3 is a schematic diagram of a partial housing structure according to an embodiment of the present invention;

[0043] Figure 4 For the present invention Figure 3 partial housing disassembly schematic diagram;

[0044] Figure 5 FIG. 5 is a schematic diagram of the separation of the motor, the blade and the housing according to an embodiment of the present invention;

[0045] Figure 6 FIG. 6 is a schematic diagram of the adjustment window in the open position according to an embodiment of the present invention;

[0046] Figure 7 FIG. 7 is a schematic diagram of the adjustment window in the closed position according to an embodiment of the present invention;

[0047] Figure 8 FIG. 8 is a schematic diagram of the positional relationship between the diversion pipe and the motor according to the present invention;

[0048] Figure 9 For the present invention Figure 8 schematic diagram of the structure from another perspective;

[0049] Figure 10Schematic structural diagram of a partial housing after sectioning according to an embodiment of the present invention;

[0050] Figure 11 Schematic diagram of the positional relationship among the accommodation box, the air supply chamber, and the blades according to an embodiment of the present invention;

[0051] Figure 12 For the present invention Figure 11 Schematic structural diagram from another perspective;

[0052] Figure 13 Schematic diagram of the separated state of the adjusting ring and the annular plate according to an embodiment of the present invention;

[0053] Figure 14 Schematic sectional view of the accommodation box according to an embodiment of the present invention;

[0054] Figure 15 Schematic diagram of the connection relationship between the drive shaft and the motor according to an embodiment of the present invention;

[0055] Figure 16 Schematic diagram of the states of the drive rod at different positions within the drive shaft according to an embodiment of the present invention;

[0056] Figure 17 Schematic structural diagram of the drive rod according to an embodiment of the present invention.

[0057] In the figure, 100, electric pickaxe; 1, motor; 11, drive shaft; 111, opening; 112, flow channel; 113, duct; 114, heat exchange port; 115, blade; 2, housing; 21, air supply chamber; 22, air outlet; 23, second space; 24, second air outlet hole; 25, annular plate; 251, rotation chamber; 252, fixing hole; 26, protective plate; 261, third air outlet hole; 3, accommodation box; 31, top plate; 311, first sub - plate body; 3111, air inlet; 312, second sub - plate body; 3121, second hole; 32, side plate; 321, first hole; 33, rotating ring; 331, first air outlet hole; 332, exhaust port; 34, first space; 35, adjusting plate; 351, first plate; 352, second plate; 4, adjusting ring; 41, second adjusting hole; 42, tooth system; 43, adjusting gear; 5, guide pipe; 51, inclined pipe section; 52, straight pipe section; 6, seal; 7, fixed chuck; 8, drive rod; 81, second bearing; 82, connecting rod; 83, lumen; 831, air duct; 84, liquid absorption core; 9, transmission assembly; 91, first gear; 92, second gear; 93, third gear; 94, fourth gear; 95, reversing gear set; 96, fifth gear; 97, sixth gear; 10, impact assembly; 101, eccentric wheel; 102, swing rod; 103, rammer; 104, impact rod. Detailed implementation manners

[0058] The specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but are not used to limit the scope of the present invention.

[0059] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present invention. It should be understood that the present invention uses the terms "first", "second", etc. to describe various information, but these information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information can also be called "second" information, and similarly, "second" information can also be called "first" information.

[0060] Referring to Figures 1 - 17 As shown, in a first aspect, an embodiment of the present application provides a handheld multi-mode electric pickaxe 100, which includes a motor 1, a transmission assembly 9, and an impact assembly 10. The handheld multi-mode electric pickaxe 100 in the present application has a hammering mode and a hammer-drilling mode. The handheld multi-mode electric pickaxe 100 further includes: a housing 2, and the motor 1, the transmission assembly 9, and the impact assembly 10 are all housed in the housing 2. The present embodiment provides a structure capable of realizing the hammering mode and the hammer-drilling mode, specifically as follows: The impact assembly 10 includes an eccentric wheel 101 and a swing rod 102 rotatably installed on the eccentric wheel 101. The other end of the swing rod 102 is rotatably installed with a ram 103. The ram 103 is slidably installed in the housing 2. A striker 104 is provided at the end of the ram 103 facing away from the swing rod 102. A bearing seat is installed in the housing 2 and a first bearing is assembled in the bearing seat. The striker 104 passes through the inner ring of the first bearing, and the striker 104 is slidably installed on the inner ring of the first bearing along the axial direction of the first bearing. A chute for slidably assembling with the striker 104 can be provided in the inner ring of the first bearing, so that the striker 104 can slide an appropriate distance along the axial direction of the first bearing. And an elastic member is connected between the striker 104 and the housing 2. The elastic member is used to enable the striker 104 to complete reset under the action of the elastic member when the ram 103 is disengaged from the striker 104. Or the striker 104 is directly coaxially fixedly installed on the inner ring of the first bearing. A compression deformation member (such as a rubber block, used to buffer the impact force of the ram 103 to a certain extent) is provided at the end of the striker 104 facing the ram 103. When the ram 103 hammers the compression deformation member, it causes a certain degree of compression deformation, and then transmits the impact force to the striker 104, and finally realizes the demolition operation through the striker 104 and the pickaxe head.

[0061] One end of the striking rod 104 away from the hammer 103 is connected with a fixed chuck 7, and the fixed chuck 7 is used for fixing a drill bit or a pick head; the transmission assembly 9 includes a first gear 91, and the first gear 91 is coaxially sleeved on the driving shaft 11 of the motor 1. The first gear 91 drives a second gear 92 that rotates coaxially with the eccentric wheel 101; a third gear 93 is arranged below the second gear 92, and the third gear 93 rotates coaxially with the second gear 92. The third gear 93 meshes with a fourth gear 94 rotatably installed in the housing 2. The fourth gear 94 drives a fifth gear 96 through a reversing gear set 95. The fifth gear 96 meshes with a sixth gear 97, and the sixth gear 97 is coaxially sleeved on the outer periphery of the striking rod 104; the shaft of the fifth gear 96 is a telescopic shaft, such as an electric telescopic rod. By controlling the telescopic movement of the electric telescopic rod, the meshing or disengagement between the fifth gear 96 and the sixth gear 97 can be realized (both the fifth gear 96 and the sixth gear 97 are helical gears, which can preferably avoid the situation of tooth collision during the process of disengagement to meshing between the two, and reduce the wear between the two).

[0062] When the electric pick 100 executes the hammering mode, the pick head is installed in the fixed chuck 7 at this time; first, control the telescopic movement of the shaft of the fifth gear 96 to make the fifth gear 96 disengage from the sixth gear 97. When the motor 1 is started, the driving shaft 11 drives the eccentric wheel 101 to rotate through the first gear 91 and the second gear 92. The eccentric wheel 101 drives the swing rod 102 to cooperate with it, so as to drive the hammer 103 to reciprocate in the housing 2. On the reciprocating movement path of the hammer 103, when the hammer 103 moves to the limit position in the direction away from the eccentric wheel 101, the hammer 103 hits the striking rod 104, and the impact force is transmitted to the pick head through the striking rod 104, so as to realize the crushing treatment of hard structures (such as cement, concrete, etc.); at this time, since the fifth gear 96 and the sixth gear 97 are in a disengaged state, the striking rod 104 will not rotate.

[0063] When the electric pick 100 executes the hammer drilling mode, the drill bit is installed in the fixed chuck 7 at this time; the fifth gear 96 shaft is controlled to telescopically move, so that the fifth gear 96 and the sixth gear 97 are meshed. When the motor 1 is started, the drive shaft 11 rotates the eccentric wheel 101 brought by the first gear 91 and the second gear 92, and the eccentric wheel 101 drives the hammer 103 to reciprocate in the shell 2 through the rocker rod 102 matched therewith. On the reciprocating movement path of the hammer 103, when the hammer 103 moves to the extreme position in the direction away from the eccentric wheel 101, the hammer 103 hits the impact Rod 104 transmits the impact force to the pickaxe head through the impact rod 104, thereby achieving the crushing of hard structures (such as cement, concrete, etc.); at the same time, the transmission of the second gear 92, the third gear 93, the fourth gear 94, and the reversing gear set 95 is synchronized to drive the fifth gear 96 to rotate, and with the rotation of the fifth gear 96, the sixth gear 97 of the synchronous belt rotates, and finally the belt rotation is realized. The impact rod 104 installed in the shell 2 rotates synchronously at a preset speed. At this time, the drill bit is hit by the hammer 103 while rotating, thereby realizing the work in the hammer drilling mode.

[0064] The above is only an implementation method provided by the embodiment of the present application that enables the electric pick 100 to realize the functions of the hammer mode and the hammer drill mode. Any other structure that can realize the above functions can be used, and the present application does not limit the structure that can realize the above functions; and the innovation point of the present application does not lie in this. The innovation point of the present application lies in how to achieve the possibility of reducing the dust intrusion into the motor 1 as much as possible on the basis of efficient cooling and heat dissipation of the motor 1; because the electric pick 100 often generates a lot of dust when performing demolition work on some structures such as cement and concrete, and a lot of dust fills the working environment of the electric pick 100, resulting in When the motor 1 in the electric pick 100 is ventilated and cooled, the dust in the air is easily sent into the motor 1 along with the cold air, resulting in a layer of dust adhering to the surface of the stator and rotor in the motor 1. The dust attached to the surface forms a heat insulation layer, which also increases the thermal resistance, resulting in the heat of the motor 1 being unable to dissipate outwards quickly and efficiently. In addition, the multi-mode electric pick 100 needs to switch between different functional modes when working, which results in the electric pick 100 often needing to work for a long time and continuously, which will cause the motor 1 to frequently overheat and automatically shut down, affecting the work efficiency while also affecting the life of the motor 1.

[0065] The following mainly provides a detailed description of how to implement the solution of cooling, dissipating and reducing the intrusion of dust into the motor 1; it should be noted that: the solution of cooling, dissipating and reducing the intrusion of dust into the motor 1 in the present application is applicable to any electric pick 100, electric hammer, electric drill and other electric tools, and is not limited to the multi-mode electric pick 100 in the present application.

[0066] As Figure 14 shown, a receiving box 3 is provided inside the housing 2, and the motor 1 is housed in the receiving box 3. In the radial direction of the motor 1, there is a gap between the outer periphery of the motor 1 and the inner side wall of the receiving box 3, so that a first space 34 is formed between the outer periphery of the motor 1 and the inner side wall of the receiving box 3; wherein, the driving shaft 11 of the motor 1 passes upward through the receiving box 3; inside the housing 2 above the receiving box 3, a blade 115 is provided, and the blade 115 is coaxially and fixedly sleeved on the driving shaft 11 of the motor 1. Among them, the space between the blade 115 and the receiving box 3 forms a blowing cavity 21; As Figure 3 、 Figure 10 shown, an air outlet 22 communicating with the outside and the blowing cavity 21 is provided on the housing 2, and there are a plurality of air outlets 22, and the plurality of air outlets 22 are spaced around the axial direction of the motor 1 and distributed on the side wall of the housing 2, wherein the air outlet 22 is provided on the side wall of the housing 2 above the blade 115; when the motor 1 is started, the blade 115 driven by the driving shaft 11 rotates inside the housing 2, so as to realize sucking the outside cold air into the blowing cavity 21 through the air outlet 22.

[0067] In this embodiment, as Figure 10 shown, a plurality of diversion tubes 5 are provided in the first space 34, and the plurality of diversion tubes 5 are spaced around the axial direction of the motor 1 and distributed in the first space 34; in the axial direction of the motor 1, the upper ends of the respective diversion tubes 5 communicate with the blowing cavity 21 and the lower ends communicate with the outside environment; when the motor 1 starts to work, the outside cold air is sucked into the blowing cavity 21 through the air outlet 22, and then enters each diversion tube 5 through the blowing cavity 21. The cold air exchanges heat with the hot gas in the first space 34 (the heat generated by the motor 1 during operation causes the temperature of the environment in the first space 34 to rise) during the process of flowing through the diversion tubes 5, so as to transfer the heat from the first space 34 to the cold air flowing through the diversion tubes 5, and is discharged from the lower end of the diversion tubes 5 to the environment outside the housing 2 along with the movement of the cold air, so as to realize the effect of cooling and dissipating heat of the motor 1. In the above process, since the air flow does not directly contact the motor 1 (indirect heat dissipation), it is avoided that the dust mixed in the air flow invades the inside of the motor 1, resulting in a layer of dust adhering to the surfaces of the stator and rotor inside the motor 1, reducing the heat dissipation efficiency of the motor 1 and causing the motor 1 to frequently generate high temperature and overheat; this embodiment is only applicable to cooling and dissipating heat of the motor 1 when the temperature of the motor 1 is in a relatively low state.

[0068] In this embodiment, when the temperature inside the motor 1 continues to rise, the above indirect heat dissipation method can no longer suppress the increase of the temperature of the motor 1. At this time, direct heat dissipation needs to be carried out on the motor 1; based on this, this embodiment provides an implementation method that can directly dissipate heat from the motor 1 when the temperature of the motor 1 continues to rise, as follows:

[0069] A plurality of adjustment windows are provided on the circumferential side wall of the accommodation box 3, and each adjustment window has an open position and a closed position. When the motor 1 is cooled by an indirect heat dissipation method, each adjustment window is in the closed position (as Figure 7 shown), for sealing the accommodation box 3, so that the environment where the motor 1 is located is isolated from the outside world, so as to indirectly dissipate heat from the motor 1 (to prevent dust mixed in the air from entering the motor 1); when the temperature in the motor 1 continues to rise, each adjustment window moves from the closed position to the open position (as Figure 6 shown), so that the accommodation box 3 is opened and the first space 34 is communicated with the external environment. At this time, under the action of the blade 115, the cold air flow directly enters the accommodation box 3 from the air supply chamber 21 and directly flows through the surface of the motor 1, so as to directly dissipate heat from the motor 1, thereby increasing the heat dissipation efficiency and suppressing the rise of the temperature of the motor 1; at this time, the cooling and heat dissipation of the motor 1 are the primary requirements to avoid the situation that the motor 1 stops working due to overheating.

[0070] Referring to Figure 5 、 Figure 6 、 Figure 7 shown, in an embodiment of the present application, the accommodation box 3 includes a top plate 31, and the drive shaft 11 passes through the top plate 31 from bottom to top; and a side plate 32. Axially of the motor 1, one end of the side plate 32 is connected to the bottom wall of the top plate 31, and the other end is fixedly abutted against the bottom wall of the housing 2 (exemplarily, the bottom end of the side plate 32 can be fixedly installed on the bottom wall of the housing 2 through fasteners, or connected and fixed to the bottom wall of the housing 2 by welding), so that the top plate 31, the side plate 32 and the bottom wall of the housing 2 enclose a sealed environment for placing the motor 1; in this embodiment, both the top plate 31 and the side plate 32 should be made of materials with relatively high thermal conductivity, including but not limited to materials such as copper and aluminum; thereby further improving the efficiency of heat conduction from the heat generated by the motor 1 to the outside.

[0071] Referring to Figure 5 、 Figure 6 、 Figure 7 shown, in an embodiment of the present application, the top plate 31 includes a first sub-plate body 311, and the first sub-plate body 311 is coaxially sleeved on the drive shaft 11; the upper ends of the respective diversion tubes 5 are all connected to the first sub-plate body 311; and a second sub-plate body 312, the second sub-plate body 312 is coaxially arranged outside the first sub-plate body 311, and the end of the second sub-plate body 312 away from the first sub-plate body 311 is fixedly connected to the side plate 32, and the end of the second sub-plate body 312 close to the first sub-plate body 311 is rotatably connected to the circumferential side of the first sub-plate body 311; the inner circumferential side of the second sub-plate body 312 is in rotational contact and cooperation with the outer circumferential side of the first sub-plate body 311, thereby forming the structure of the top plate 31; as Figure 9 、 Figure 10As shown, in this embodiment, the accommodation box 3 further includes a swivel ring 33. The swivel ring 33 is rotatably mounted coaxially on the bottom wall of the housing 2. In the axial direction of the motor 1, the swivel ring 33 penetrates through the bottom wall of the housing 2, that is, the upper and lower ends of the swivel ring 33 respectively penetrate through the upper and lower ends of the bottom wall of the housing 2. Preferably, in this embodiment, the upper and lower ends of the swivel ring 33 are flush with the upper and lower ends of the bottom wall of the housing 2. The lower ends of the respective guide pipes 5 are fixedly connected to the swivel ring 33. As Figure 8 shown, an air inlet 3111 communicating with the upper end of the guide pipe 5 is provided on the first sub-board body 311. As Figure 9 shown, an air outlet 332 communicating with the lower end of the guide pipe 5 is provided on the swivel ring 33. In this way, the cold air flow in the air supply chamber 21 first enters the guide pipe 5 through the air inlet 3111 provided on the first sub-board body 311, and after flowing through the guide pipe 5, it is discharged outward from the air outlet 332 provided on the swivel ring 33, so as to achieve the effect that the cold air flow flows through the guide pipe 5 from the air supply chamber 21 and exchanges heat with the relatively hot air in the accommodation box 3 in the guide pipe 5 and then is discharged outward.

[0072] In this embodiment, the first sub-board body 311 is sleeved and fixed on the drive shaft 11 of the motor 1. When the motor 1 operates, the first sub-board body 311 is synchronously driven to rotate, thereby driving the plurality of guide pipes 5 and the swivel ring 33 to rotate. In this embodiment, the guide pipe 5 is a metal structural member. On the one hand, it can have sufficient stiffness to rotate the swivel ring 33 for the synchronous belt. On the other hand, the guide pipe 5 is made of metal (such as copper, which has a high heat conduction coefficient), which can improve the heat exchange efficiency between the cold air flow in the guide pipe 5 and the hot air in the accommodation box 3. The plurality of guide pipes 5 rotate in the first space 34 formed between the circumference of the motor 1 and the inner side wall of the accommodation box 3, so that the cold air flow flowing through the guide pipe 5 can better come into full contact with the hot air in the accommodation box 3, and thus can exchange heat with the hot air in a larger range, thereby improving the cooling efficiency of the motor 1. Compared with the fixed arrangement mode of the guide pipe 5, the cold air flow flowing through the guide pipe 5 can only exchange heat with the hot air around the guide pipe 5. Obviously, the rotation of the plurality of guide pipes 5 in the accommodation box 3 can produce a more efficient cooling effect.

[0073] As Figure 6As shown, in the present embodiment, the regulating window can be arranged on the second sub-plate body 312 or on the side plate 32 or on the side plate 32 and the second sub-plate body 312, as long as when the regulating window is opened, the housing box 3 can be opened and the environment where the motor 1 is located can be connected with the outside world; as a preferred embodiment, the regulating window is arranged on the side plate 32 and the second sub-plate body 312, thereby increasing the communication range between the sealed environment in the housing box 3 and the external environment when the regulating window is opened; for example, the cold air flow can directly enter the housing box 3 from part of the regulating window on the second sub-plate body 312 and In order to generate heat exchange with the motor 1, a plurality of first air outlet holes 331 penetrating the rotating ring 33 are provided on the rotating ring 33 in the present embodiment. The first air outlet holes 331 and the air guide tube 5 are staggered. The arrangement of the plurality of first air outlet holes 331 enables, when part of the adjustment windows on the second sub-plate 312 is opened, the cold air flow directly flows through the surface of the motor 1 and generates heat exchange with the motor 1, and is finally discharged outwardly from the plurality of first air outlet holes 331 on the rotating ring 33. The arrangement of the plurality of first air outlet holes 331 is used to discharge the air flow outwardly from the containing box 3 when the adjustment windows are opened and the motor 1 is directly cooled.

[0074] When part of the adjustment window located on the side panel 32 is opened, the environment in the storage box 3 is in direct contact with the side wall of the shell 2, so that the heat in the storage box 3 can be directly dissipated and transferred to the outside through the shell 2, thereby avoiding the need for heat conduction through the side panel 32 before the heat can continue to be dissipated and transferred to the outside, thereby improving the effect of heat transfer from the storage box 3 to the outside, and further improving the cooling and heat dissipation efficiency of the motor 1 in the storage box 3.

[0075] In this embodiment, if Figure 8 , Figure 14 As shown, the air guide pipe 5 includes an inclined pipe section 51 and a vertically arranged straight pipe section 52, wherein the inclined pipe section 51 is connected to the air inlet 3111 located on the first sub-plate body 311, and the straight pipe section 52 is connected to the air outlet 332 located on the rotating ring 33; since the upper end of the air guide pipe 5 is connected to the first sub-plate body 311, the air guide pipe 5 is arranged as the inclined pipe section 51 and the straight pipe section 52, which can effectively reduce the size area of ​​the first sub-plate body 311 (that is, reduce the diameter of the first sub-plate body 311), so that the radial size of the second sub-plate body 312 is as large as possible; thus, when part of the adjustment window provided on the second sub-plate body 312 is opened, in the axial direction of the motor 1, more areas of the motor 1 body can be directly exposed to the partially opened adjustment window range on the second sub-plate body 312, so that when the motor 1 is directly cooled, the cold air flow can contact more of the motor 1 body, thereby improving the heat exchange efficiency, and finally improving the cooling and heat dissipation effect of the motor 1.

[0076] Reference Figure 6 ,Figure 7 As shown, in an embodiment of the present application, the adjustment window includes a first hole 321 provided on the side plate 32. In the radial direction of the motor 1, the first hole 321 penetrates through the side plate 32, and in the axial direction of the motor 1, the first hole 321 penetrates through the side plate 32; and a second hole 3121 provided on the second sub-plate body 312. In the radial direction of the motor 1, the second hole 3121 penetrates through the outer peripheral side of the second sub-plate body 312, and in the axial direction of the motor 1, the second hole 3121 penetrates through the second sub-plate body 312; exemplarily, in this embodiment, in the radial direction of the motor 1, the second hole 3121 may completely penetrate the second sub-plate body 312, or may only penetrate a part of the second sub-plate body 312 (but must penetrate one end of the outer peripheral side of the second sub-plate body 312); in the axial direction of the motor 1, the first hole 321 may penetrate through the entire side plate 32, or may only penetrate a part of the side plate 32 (but must penetrate one end of the side wall close to the second sub-plate body 312); when the second hole 3121 completely penetrates the second sub-plate body 312 and the first hole 321 completely penetrates the side plate 32, it will make the contact area and area between the environment inside the accommodation box 3 and the external environment increase when the adjustment window is opened, thereby improving the heat exchange efficiency; but at this time, there may be a certain impact on the overall structural strength of the accommodation box 3; when the second hole 3121 only penetrates a part of the second sub-plate body 312 and the first hole 321 only penetrates a part of the side plate 32, it will make the accommodation box 3 maintain a certain structural strength, but when the adjustment window is opened, the contact area between the environment inside the accommodation box 3 and the external environment may be relatively reduced, and there may be a certain impact on the heat exchange efficiency; those skilled in the art can choose a suitable setting method according to actual needs when implementing this solution specifically.

[0077] In the radial direction of the motor 1, the positions of the first hole 321 and the second hole 3121 correspond to form a first adjustment hole; the adjustment plate 35 is movably connected to the accommodation box 3 along the circumferential direction of the accommodation box 3, as Figure 6As shown, the specific adjusting plate 35 includes a first plate 351 and a second plate 352 connected to each other. The first plate 351 is horizontally arranged and slidably assembled in the second sub-plate body 312, and the second plate 352 is vertically arranged and slidably assembled in the side plate 32 (the shape of the second plate 352 is adapted to the shape of the side plate 32 so that the second plate 352 can move within the side plate 32); Exemplarily, in the second sub-plate body 312 and the side plate 32, there are sliding cavities for accommodating the first plate 351 and the second plate 352 respectively, and the sliding cavity in the second sub-plate body 312 communicates with the sliding cavity in the side plate 32, so that the adjusting plate 35 composed of the first plate 351 and the second plate 352 can move towards the first adjusting hole within the side plate 32 and the second sub-plate body 312 (so that the adjusting plate 35 is in the closed position) and close the first adjusting hole; or can move from the first adjusting hole into the second sub-plate body 312 and the side plate 32 (so that the adjusting plate 35 is in the open position) and open the first adjusting hole.

[0078] Exemplarily, in this embodiment, the side plate 32 and the second sub-plate body 312 can be integrally provided or separately provided. When the side plate 32 and the second sub-plate body 312 are integrally provided, the above-mentioned sliding cavity can be directly formed by stamping on the above-mentioned integral structural member; when the side plate 32 and the second sub-plate body 312 are separately provided, they can be connected by welding or fasteners. At this time, the above-mentioned sliding cavities need to be respectively opened on the side plate 32 and the second sub-plate body 312, and when assembling the side plate 32 and the second sub-plate body 312, the two sliding cavities are communicated; As a preference, in this embodiment, the side plate 32 and the second sub-plate body 312 are integrally provided, which can reduce the processing difficulty of parts and reduce the use of spare parts.

[0079] Exemplarily, in this embodiment, as Figure 6 , Figure 7 shown, two adjusting plates 35 can be provided in the same first adjusting hole or one adjusting plate 35 can be provided; when two adjusting plates 35 are provided in the same first adjusting hole, at this time, sliding cavities need to be respectively opened on the side walls of the side plate 32 and the second sub-plate body 312 on both sides of the first adjusting hole. When the first adjusting hole needs to be closed, the two adjusting plates 35 respectively slide out from the corresponding sliding cavities and move towards each other. When the two adjusting plates 35 abut against each other on the opposite sides, the first adjusting hole is closed; when one adjusting plate 35 is provided in the same first adjusting hole, at this time, only the sliding cavities need to be opened on the side walls of the second sub-plate body 312 and the side plate 32 on one side of the first adjusting hole. The specific operation method is the same as above and will not be described in detail here.

[0080] Exemplarily, this embodiment provides a specific method for driving the adjustment plate 35 to move between the open position and the closed position, the adjustment plate 35 and the sliding cavity can be connected via an elastic member (such as a spring), an electromagnetic driving member (electromagnet) is provided in the sliding cavity, and a structural member that is easily attracted by magnetism is provided on the side of the adjustment plate 35 facing the electromagnetic driving member, and it is set that when the adjustment plate 35 is in the open position, the elastic member is in a compressed state; when the adjustment window needs to be opened, the electromagnetic driving member is controlled to be energized and generate electromagnetic force, and the adjustment plate 35 is attracted by magnetic force to move the adjustment plate 35 from the closed position to the open position (compressing the elastic member); when the adjustment window needs to be closed, the electromagnetic driving member is controlled to lose power and electromagnetic force, so that the adjustment plate 35 moves from the open position to the closed position under the elastic force of the elastic member; the above embodiment is only one of the embodiments that can drive the adjustment plate 35 to move directly between the open position and the closed position, and any other structure that can realize the above method can be used in this embodiment to drive the adjustment plate 35 to move between the open position and the closed position.

[0081] In this embodiment, if Figure 6 , Figure 14 As shown, when the adjustment window is in the open position, the first adjustment hole is in the open state, and the cold air flow from the air supply cavity 21 directly flows through the surface of the motor 1 from the opened first adjustment hole and realizes direct cooling and heat dissipation of the motor 1; at the same time, the plurality of guide tubes 5 rotate synchronously with the driving shaft 11 at a high speed; with the high-speed rotation of the guide tube 5, and under the cooperation between the inclined pipe section 51 and the straight pipe section 52, the first space 34 and the staggered area with the first adjustment hole (that is, Figure 6 The hot air in the area b shown in FIG. 1 is pushed to the position of the first adjustment hole (such as Figure 6 After mixing with the cold air flow passing through the first regulating hole (generating heat exchange), the gas that has partially completed the heat exchange moves downward with the cold air flow and is finally discharged to the external environment; due to the first space 34 and the staggered area with the first regulating hole (that is, Figure 6 Part of the hot air in the area b shown in the figure is pushed to the first adjustment hole and is carried away by the high-speed airflow from top to bottom and discharged to the outside; it should be noted that: when the first space 34 and the area staggered with the first adjustment hole (that is, Figure 6 When the hot air in the area b) shown in the figure moves to the area c under the push of the guide tube 5 (assuming that the rotation direction of the guide tube 5 is counterclockwise), the air pressure in the area b is reduced and a certain degree of negative pressure is generated. Under the action of the air pressure difference, the airflow (cold air) in the area a quickly flows into the area b, thereby achieving the effect of replacing the hot air in the area b (the area where the cold airflow cannot flow from top to bottom) with the cold air, providing a more efficient cooling and heat dissipation effect for the motor 1.

[0082] Referring to Figure 10 and Figure 11 As shown, in an embodiment of the present application, in the radial direction of the motor 1, the circumferential side of the accommodation box 3 is spaced from the inner wall of the housing 2, so that the space between the circumferential side of the accommodation box 3 and the inner wall of the housing 2 forms a second space 23 communicating with the air supply cavity 21; in the axial direction of the motor 1, a plurality of second air outlet holes 24 are provided on the bottom wall of the housing 2 corresponding to the second space 23; with this setting, when indirectly cooling and dissipating heat from the motor 1, the cold air flow moving from the air supply cavity 21 respectively flows through the accommodation box 3 through a plurality of diversion pipes 5, so as to cool and dissipate the environment in the accommodation box 3; at the same time, part of the cold air flow also flows through the second space 23, that is, flows through the circumferential side position of the accommodation box 3, thereby further improving the heat exchange efficiency between the cold air flow and the gas with a higher temperature in the accommodation box 3, and further improving the cooling and heat dissipation effect on the motor 1; the cold air flow flowing through the second space 23 finally discharges to the external environment from the second air outlet holes 24 located on the bottom wall of the housing 2.

[0083] Exemplarily, in this embodiment, as Figure 12 shown, a protective plate 26 can be additionally provided below the bottom wall of the housing 2, and the protective plate 26 and the bottom wall of the housing 2 are spaced apart by a certain distance. The circumferential side of the protective plate 26 is fixedly connected to the housing 2. An annular cylinder (not labeled in the figure) protrudes upward at a position close to the center of the protective plate 26, and the upper end of the annular cylinder is fixedly connected to the bottom wall of the housing 2. The reason for setting the protective plate 26 and the annular cylinder is that on the one hand, it is used to set a layer of isolation barrier between the rotating ring 33 and the outside world to avoid safety accidents caused by accidental contact with the high-speed rotating rotating ring 33 when the user uses it; on the other hand, the protective plate 26 and the annular cylinder are used to support a part of the bottom wall of the housing 2, because a part of the housing 2 located inside the rotating ring 33 and other parts of the housing 2 are separated by the rotating ring, so it is necessary to additionally set a structural member for supporting the part of the housing 2 located inside the rotating ring 33. In this embodiment, the protective plate 26 and the annular cylinder play the role of supporting and holding the part of the housing 2 located inside the rotating ring 33.

[0084] Due to the setting of the protective plate 26, holes for discharging the hot air flow need to be provided on the protective plate 26. Therefore, a plurality of third air outlet holes 261 are provided on the protective plate 26. The plurality of third air outlet holes 261 are arranged at intervals around the annular cylinder on the protective plate 26, so as to discharge the air flow discharged from the housing 2 to the external environment through the plurality of third air outlet holes 261.

[0085] Referring to Figure 12 As shown, in an embodiment of the present application, one end of the drive shaft 11 away from the blade 115 extends downward out of the housing 2, that is, extends downward out of the bottom wall of the housing 2, and is placedFigure 12 inside the annular cylinder shown (the lower end of the annular cylinder has an opening communicating with the outside, so that the space inside the loop cylinder is communicated with the outside), at this time, the lower end of the drive shaft 11 is exposed to the external environment; as Figure 6 、 Figure 7 、 Figure 8 shown, a plurality of openings 111 are provided at the circumferential side position of the part of the drive shaft 11 located inside the air supply chamber 21, and the plurality of openings 111 are arranged at intervals; in this embodiment, too many openings 111 will cause the overall rigidity of the drive shaft 11 to decrease, and too few openings 111 will make it difficult to achieve a good cooling and heat dissipation effect; preferably, three openings 111 are selected and arranged at equal intervals on the circumferential side of the drive shaft 11; as Figure 12 、 Figure 16 shown, a flow channel 112 is provided inside the drive shaft 11, each opening 111 corresponds to a flow channel 112, and the upper end of the flow channel 112 is communicated with the opening 111, and the lower end of the flow channel 112 penetrates downward through the drive shaft 11.

[0086] In this embodiment, by providing the matching openings 111 and flow channels 112 on the drive shaft 11, part of the cold air flow located inside the air supply chamber 21 can enter the flow channel 112 through the openings 111 and flow through the flow channel 112, so that during the movement of the cold air flow in the flow channel 112, it can directly cool and dissipate heat from the inside of the motor 1. Since the drive shaft 11 is located at the core position of the motor 1, the temperature here is usually relatively high, and the cold air flow directly flows through the flow channel 112 inside the drive shaft 11, which can achieve a more efficient cooling effect on the motor 1; during the flow of the cold air flow in the flow channel 112, it will inevitably carry the dust it carries into the flow channel 112, and over time, it will adhere to the inner wall of the flow channel 112, thereby affecting the heat exchange efficiency. Since the bottom ends of the flow channels 112 all penetrate the drive shaft 11 and communicate with the external environment, and the bottom of the drive shaft 11 extends downward out of the housing 2, the user can regularly clean the dust adhering to the inner wall of the flow channel 112; for example: a rod-shaped member (the cross-sectional size of the rod is slightly smaller than the cross-sectional size of the flow channel) can be used and a layer of cleaning cotton is wrapped around it. The user inserts the rod-shaped member wrapped with cleaning cotton into the flow channel 112 from bottom to top, and through the contact friction between the cleaning cotton and the inner wall of the flow channel 112, the dust adhering to the inner wall of the flow channel 112 can be cleaned; during the above process, the inner wall of the flow channel 112 can be cleaned without disassembling the housing 2, and the operation is simple and convenient.

[0087] Referring to Figure 6 、 Figure 7 、 Figure 8 、 Figure 16As shown, in an embodiment of the present application, the handheld multi-mode electric pickaxe 100 further includes a seal 6 movably disposed in the opening 111. The seal 6 has an expanded position and a retracted position. In this embodiment, the bottom of the seal 6 is rotatably mounted on two opposite side walls of the opening 111. The outer peripheral side of the seal 6 is adapted to the shape of the drive shaft 11. When the seal 6 is in the retracted position, the outer peripheral contour of the seal 6 is kept matching with the outer peripheral contour of the drive shaft 11 and the opening 111 is blocked. Because a plurality of openings 111 are provided on the circumferential side of the drive shaft 11, the integrity of the surface of the drive shaft 11 is damaged by the arrangement of the openings 111. When the drive shaft 11 rotates at a high speed, air flow will form a turbulent flow or a turbulent current at the openings 111, which will further cause an increase in the noise generated when the motor 1 operates. Thus, when the temperature of the motor 1 is still in a relatively low range, the opening 111 can be blocked by the seal 6, so that the drive shaft 11 can be a complete arc surface at the position of the opening 111. In this way, when the drive shaft 11 rotates at a high speed, no turbulent flow or turbulent current will be generated at the openings 111, and thus the noise generated when the motor 1 operates is reduced.

[0088] In this embodiment, when the temperature of the motor 1 continues to rise, at this time, cooling and heat dissipation of the motor 1 have become more urgent (the noise level of the motor 1 during operation is no longer the primary consideration). In order to further improve the cooling and heat dissipation efficiency of the motor 1 in the indirect heat dissipation mode, the above-mentioned seal can be moved from the retracted position to the expanded position, so as to open the opening 111, so that the cold air flow in the air supply chamber 21 enters the flow channel 112 through the opening 111, and during the movement in the flow channel 112, heat exchange is carried out with the most core area inside the motor 1, thereby improving the cooling and cooling efficiency of the motor 1.

[0089] When the seal 6 in this embodiment is in the expanded position, it can also play a role in guiding the air flow in the air supply chamber 21 to a certain extent. The air flow in the air supply chamber 21 moves from top to bottom under the action of the blade 115. When it moves to the seal 6 in the expanded position, the air flow is blocked by the seal 6 and then moves towards the opening 111 along the inclined surface of the seal 6 body. Exemplarily, in order to further improve the guiding effect of the seal 6 on the air flow when it is in the expanded position, a guiding groove can be provided on the seal 6 on the side towards the axial center line of the drive shaft 11, and the bottom wall of the guiding groove opposite to the outer peripheral side of the seal 6 is set as an inclined surface. In this way, as Figure 8 shown, when the cold air flow moving rapidly from top to bottom in the air supply chamber 21 moves to the position of the seal 6, the air flow will enter the guiding groove and is guided into the opening 111 under the action of the inclined bottom wall of the guiding groove, and finally enters the flow channel 112 through the opening 111 for heat exchange with the core area of the motor 1.

[0090] In this embodiment, when the temperature of the motor 1 continues to rise, the seal 6 has been moved from the retracted position to the expanded position, and the opening 111 is in an open state; in order to further increase the flow rate of the airflow from the guide tube 5 and the flow channel 112 provided in the drive shaft 11, the flow rate of the cold airflow in the second space 23 can be reduced or the second space 23 can be closed and the cold airflow can be prevented from passing through the second space 23. Because the second space 23 is at the farthest position from the core area of ​​the motor 1 relative to the guide tube 5 and the flow channel 112, the efficiency of cooling and dissipating the heat of the cold airflow flowing through the second space 23 on the motor 1 is obviously not as good as the efficiency of cooling and dissipating the heat of the cold airflow flowing through the guide tube 5 and the flow channel 112 on the motor 1; therefore, when the rotation speed of the blade 115 is constant (the air volume remains unchanged), the second space 23 is closed so that all the cold airflow passes through multiple guide tubes 5 and the flow channel 112, which can increase the efficiency of cooling and dissipating the heat of the motor 1.

[0091] Based on the above, this embodiment provides a structure for achieving the above effects; Figure 11 , Figure 12 , Figure 13 As shown, an annular plate 25 is provided between the outer peripheral side of the accommodating box 3 and the inner side wall of the shell 2, and the annular plate 25 is fixedly installed on the inner side wall of the shell 2, and the end of the annular plate 25 facing away from the inner side wall of the shell 2 is in close contact with the outer periphery of the side plate 32, and a rotating cavity 251 is provided in the annular plate 25; an adjusting ring 4 is coaxially rotatably installed in the rotating cavity 251, and a plurality of second adjusting holes 41 are penetrated on the adjusting ring 4 and the plurality of second adjusting holes 41 are equidistantly spaced, and a plurality of fixing holes 252 are also provided on the annular plate 25, and the size of the fixing hole 252 is consistent with the size of the second adjusting hole 41, and the setting position of the fixing hole 252 matches the setting position of the second adjusting hole 41, so as to realize Now: when the adjustment ring 4 is in a certain state, the fixing hole 252 and the second adjustment hole 41 correspond one-to-one and are connected. At this time, the cold air flow in the air supply chamber 21 passes through the corresponding fixing holes 252 and the second adjustment holes 41 downward into the second space 23, which is used to generate heat exchange with the hot air in the containing box 3 and dissipate heat; when the adjustment ring 4 is rotated by a preset angle, the fixing hole 252 and the second adjustment hole 41 are staggered. At this time, the second adjustment hole 41 is not provided on the adjustment ring 4 so as to correspond to the position of the fixing hole 252, thereby blocking the fixing hole 252 provided on the annular plate 25, and preventing the cold air flow from entering the second space 23 from the air supply chamber 21.

[0092] When the temperature of the motor 1 is at a relatively low level, the second adjustment hole 41 provided on the adjustment ring 4 corresponds to and is connected with the fixed hole 252 on the annular plate 25, so that the cold air flow in the air supply chamber 21 can enter the second space 23; when the temperature of the motor 1 continues to rise, the seal 6 is in the open position. In order to increase the flow rate of the cold air flow in the guide tube 5 and the flow channel 112, the adjustment ring 4 is driven to rotate at a preset angle so that the fixed hole 252 and the second adjustment hole 41 are staggered, thereby realizing the use of the adjustment ring 4 to block the fixed hole 252 on the annular plate 25, so that the second space 23 is no longer connected with the air supply chamber 21. At this time, all the cold air flows in the air supply chamber 21 are moved through multiple guide tubes 5 and the flow channel 112 respectively, thereby achieving a heat exchange effect. Since the flow rate of the cold air flow in the guide tube 5 and the flow channel 112 increases, the cooling and heat dissipation efficiency of the motor 1 is improved.

[0093] Exemplarily, this embodiment provides a structure for driving the adjustment ring 4 to rotate in the annular plate 25, such as Figure 13 As shown, the outer circumference of the adjusting ring 4 is uniformly provided with a gear system 42. In the axial direction of the adjusting ring 4, the projection of the gear system 42 does not protrude from the projection of the adjusting ring 4. An adjusting gear 43 meshing with the gear system 42 is rotatably mounted on the outer side wall of the shell 2. The adjusting ring 4 is driven to rotate relative to the annular plate 25 by rotating the adjusting gear 43, thereby controlling the conduction or isolation between the second space 23 and the air supply chamber 21. As for how to drive the adjusting gear 43 to rotate, it can be manually screwed or directly driven by a micro motor. In specific implementation, it can be based on It is required to adopt a corresponding setting method; it is worth noting that: since the electric pick 100 will generate large vibrations when working, in order to avoid the adjustment ring 4 from rotating erroneously when it is vibrated, when the adjustment gear 43 is driven to rotate by manual screwing, a locking structure (such as a latch, etc.) for positioning the adjustment gear 43 can be set on the outer wall of the shell 2; when the micro motor is used to directly drive the adjustment gear 43 to rotate, the micro motor should have an electromagnetic brake, so that when the micro motor is not working, the electromagnetic brake can lock the micro motor shaft, thereby locking and positioning the adjustment ring 4.

[0094] Reference Figure 7 , Figure 8 , Figure 9 , Figure 10 , Figure 16 As shown, in one embodiment of the present application, the handheld multi-mode electric pick 100 also includes a driving rod 8 coaxially arranged in the driving shaft 11, the lower end of the driving rod 8 at least partially extends out of the driving shaft 11, and the lower end of the driving rod 8 is threadedly connected to the housing 2. For example, an external thread is provided on the bottom circumference of the driving rod 8, and a support rod (such as a support rod) for threaded installation and matching with the external thread at the bottom of the driving rod 8 is provided on the inner side wall of the annular cylinder coaxially connected to the protective plate 26. Figure 1, Figure 12 As shown in Figure 12 , by rotating the driving rod 8, it is possible to drive the driving rod 8 to move up and down within the driving shaft 11.

[0095] As Figure 16 shown in Figure 16 , a duct 113 is coaxially provided within the driving shaft 11 (the duct 113 penetrates downward through the bottom wall of the driving shaft 11, enabling the driving rod 8 to extend outward from the bottom of the driving shaft 11 into the external environment). A plurality of flow channels 112 are provided outside the duct 113 and are spaced equidistantly around the duct 113; the inner diameter of the duct 113 is slightly larger than the outer diameter of the driving rod 8, so that the driving rod 8 can move along the axial direction of the motor 1 within the duct 113 (if the inner diameter of the duct 113 is the same as the outer diameter of the driving rod 8, unnecessary wear will occur between the driving rod 8 and the inner wall of the duct 113); a second bearing 81 is sleeved on the circumferential side of the relative position of the driving rod 8 and the opening 111, that is, the inner ring of the second bearing 81 is fixed to the outer circumference of the driving rod 8. With this setting, when the seal 6 rotates at a high speed with the driving shaft 11, the outer ring of the second bearing 81 can be driven to rotate synchronously relative to its inner ring through the connecting rod 82, so as not to drive the driving rod 8 to rotate; one end of the connecting rod 82 is rotatably installed on the outer ring of the second bearing 81, and the other end of the connecting rod 82 is rotatably installed on the seal 6 (exemplarily, it can be rotatably installed on the bottom wall of the diversion groove).

[0096] In this embodiment, when it is necessary to open the opening 111, rotate the driving rod 8 to drive the driving rod 8 to move upward within the duct 113, so as to drive the seal 6 to move from the closed position to the open position through the cooperation of the second bearing 81 and the connecting rod 82; when it is necessary to close the opening 111, rotate the driving rod 8 in the opposite direction to drive the driving rod 8 to move downward within the duct 113, so as to drive the seal 6 to move from the open position to the closed position through the cooperation of the second bearing 81 and the connecting rod 82.

[0097] Exemplarily, for the power to drive the driving rod 8 to rotate in this embodiment, it can be driven manually by hand or by a micro motor (using this method will increase the cost of the electric pickaxe 100). In specific implementation, the corresponding driving method can be adopted according to actual needs; since the electric pickaxe 100 generates large vibrations during operation, in order to prevent the driving rod 8 from rotating erroneously when being vibrated, when the driving rod 8 is rotated by manual screwing, a locking structure (such as a plug) for positioning the driving rod 8 can be provided on the bottom wall of the housing 2; when the driving rod 8 is directly driven to rotate by a micro motor, the micro motor should have an electromagnetic brake, so that when the micro motor is not working, the electromagnetic brake can lock the micro motor shaft, thereby locking and positioning the driving rod 8.

[0098] Refer toFigure 17 As shown, in an embodiment of the present application, the driving rod 8 is a metal structural member, such as made of copper; and there is a lumen 83 inside the driving rod 8, and a liquid absorption core 84 is attached to the inner wall of the lumen 83. Among them, the liquid absorption core 84 is a metal sponge, which is used to absorb and store a certain amount of low-boiling-point liquid. The low-boiling-point liquid includes but is not limited to distilled water, freon, etc.; an air passage 831 is formed on the side of the liquid absorption core 84 facing away from the inner wall of the lumen 83, and the lumen 83 is in a vacuum environment. In this embodiment, the vacuum degree inside the lumen 83 is not limited, as long as it is in a certain degree of negative pressure environment.

[0099] As Figure 10 described above, since a part of the bottom end of the driving rod 8 extends out of the housing 2 and is placed in the external environment, therefore, a part of the driving rod 8 extending out of the housing 2 is the cold section B (since the cold section A is inside the driving shaft 11 and its environmental temperature is higher than the environmental temperature where the cold section B is located, making the cold section B the main area for cooling the hot section at this time), and a part of the driving rod 8 passing through the inside of the motor 1 is the hot section; thus, when the motor 1 starts to work, heat is generated inside it and the temperature of the driving shaft 11 rises synchronously. The low-boiling-point liquid in the hot section part is evaporated and gasified under the action of high temperature (resulting in a reduction in the amount of low-boiling-point liquid absorbed by the liquid absorption core 84 inside the hot section), which in turn causes the air pressure in the hot section area inside the driving rod 8 to increase, while the air pressure in the cold section B is smaller. Then, the vapor generated in the hot section will move along the air passage 831 inside the driving rod 8 towards the cold section B. When it moves to the cold section B area, the vapor releases heat here (that is, the heat is dissipated to the outside) and condenses, thus condensing into a liquid state again. The condensed liquid returns to the hot section under the action of the liquid absorption core 84 (because the amount of low-boiling-point liquid absorbed and stored by the liquid absorption core 84 in the hot section and the cold section B areas is different. To maintain balance, the low-boiling-point liquid condensed in the cold section B will flow back to the hot section along the liquid absorption core 84); and the low-boiling-point liquid that reflows to the hot section absorbs the heat in the core area of the motor again, and then repeats the above process, so as to realize the transfer of the heat in the hot section to the cold section B and finally dissipate it to the outside, thereby realizing efficient cooling and heat dissipation of the core area inside the motor 1; it should be noted that: at this time, if the method of manually screwing to drive the driving rod 8 to move up and down inside the driving shaft 11 is adopted, an insulating handle needs to be set at one end of the driving rod 8 extending out of the driving shaft 11 to avoid scalding the user's hand by the heat absorbed by the cold section B from the hot section.

[0100] In this embodiment, as Figure 6 、 Figure 7 、 Figure 8 、 Figure 16As shown in the figure, a heat exchange port 114 is provided on the drive shaft 11 at a position above the opening 111, and the heat exchange port 114 communicates with a duct 113 coaxially arranged inside the drive shaft 11; in the circumferential direction of the drive shaft 11, the heat exchange port 114 and the opening 111 are arranged staggeredly. On the one hand, it is used to avoid continuously opening holes in the axial position of the drive shaft 11, and to avoid the situation that the overall structural strength of the drive shaft 11 is reduced due to the opening of the opening 111 and the heat exchange port 114. On the other hand, when the temperature of the motor 1 further rises and drives the drive rod 8 to move upward in the drive shaft 11, driving the seal 6 to move from the retracted position to the deployed position, at this time, the upper end of the drive rod 8 (that is, Figure 17 the cold section A shown in the figure) moves to a position corresponding to the heat exchange port 114. At this time, the cold air flowing rapidly downward in the air supply chamber 21 can exchange heat with the heat in the cold section A of the drive rod 8 when flowing through the heat exchange opening (as shown by the horizontal dotted arrow in Figure 16 the figure), so as to achieve the effect of cooling the area of the drive rod 8 in the cold section A. By arranging the heat exchange port 114 and the opening 111 staggeredly, it can better avoid the gas flowing from top to bottom through the heat exchange port 114 and exchanging heat with the cold section A (carrying a certain amount of heat) from entering the opening 111 under the guidance of the seal 6 when moving downward to the height where the opening 111 is located, and then flowing back into the drive shaft 11 again from the flow channel 112 communicating with the opening 111, thus avoiding the heat originally transferred from the drive shaft 11 from flowing back into the drive shaft 11 again. Therefore, when the gas flowing through the heat exchange port 114 and exchanging heat with the cold section A of the drive rod 8 flows downward to the first partition body 311, it is blocked by the first partition body 311 and then diffuses around, that is, the heat carried by this part of the air flow will move to the peripheral edge position of the motor 1 along with the air flow diffusing around. The temperature of the peripheral edge of the motor 1 is much lower than the temperature in the core area of the motor 1 (the lower ambient temperature in the peripheral edge area of the motor 1 will dilute the heat carried by this part of the air flow). Compared with the above situation where the heat flows back into the drive shaft 11 along with the air flow, it can better avoid the temperature in the core area of the motor 1 from rising further and effectively relieve the impact of high temperature on the motor 1.

[0101] Since the air flow discharged outward from the bottom of the flow channel 112 carries more heat at this time, it makes one end of the drive rod 8 extending out of the drive shaft 11, that is, Figure 17The cold section B shown in the figure is almost surrounded by the hot air flow flowing out of the flow channel 112 (the ambient temperature of the cold section B is also at a relatively high level at this time), resulting in the cooling capacity of the cold section B on the hot section being reduced to a relatively low level; however, at this time, the part of the driving rod 8 in the cold section A moves upward to the position corresponding to the heat exchange port 114, and the cold air flow from the top to the bottom of the flow channel 112 in the air supply chamber 21 quickly flows through the heat exchange port 114 and realizes a more efficient heat exchange with the cold section A, making the cold section A at this time the main area for cooling the hot section; that is, at this time, the cold air flow flowing through the flow channel 112 and the cold section A jointly achieve the effect of efficiently cooling the core area of ​​the motor 1.

[0102] For example, in this embodiment, Figure 16 As shown, when the seal 6 is in the closed position, the upper end of the drive rod 8 is in the position as shown in FIG. Figure 16 In the position shown in the left view in the middle, that is, the upper end of the driving rod 8 is almost flush with the bottom of the heat exchange port 114, and in the axial direction of the driving shaft 11, the height of the heat exchange port 114 is consistent with the distance that the driving rod 8 drives the sealing member 6 to move from the retracted position to the extended position (therefore, the upper end of the channel 113 should also be kept at the same height as the upper top wall of the heat exchange port 114), that is, when the driving rod 8 drives each sealing member 6 to move from the retracted position to the extended position, the upper end of the driving rod 8 almost reaches the top wall position of the heat exchange port 114 (as shown in FIG. Figure 16 The above arrangement is adopted because it is necessary to avoid, as far as possible, opening a relatively long channel 113 and a heat exchange port 114 in the axial direction of the drive shaft 11; because the longer the channel 113 and the heat exchange port 114 are, the greater the impact on the overall strength of the drive shaft 11 is, and the longer the channel 113 and the heat exchange port 114 are, the greater the proportion of the hollow portion in the drive shaft 11 is, which will reduce the overall structural strength of the drive shaft 11 and is not conducive to its operation under high strength.

[0103] In this embodiment, the length of the heat exchange port 114 is set to be consistent with the distance by which the drive rod 8 moves upward, and the upper end of the duct 113 is flush with the upper top wall of the heat exchange port 114, that is, when the drive rod 8 moves a preset distance to drive each seal 6 to move from the retracted position to the deployed position, the cold section A of the drive rod 8 is as much as possible in the area corresponding to the heat exchange port 114, thereby enabling efficient heat exchange with the cold air flowing through the heat exchange port 114, achieving efficient cooling and heat dissipation of the core area of the motor 1; at the same time, it avoids the situation where the overall structural strength of the drive shaft 11 is reduced due to the excessive lengths of the duct 113 and the heat exchange port 114; if initially, that is, when each seal 6 is in the retracted position, the upper end (cold section A) of the drive rod 8 is already in the position corresponding to the heat exchange port 114, then when it is necessary to drive each seal 6 to move from the retracted position to the deployed position subsequently, the drive rod 8 needs to move upward further. Therefore, it is necessary to open a longer duct 113 and heat exchange port 114 in the drive shaft 11, which will have a greater impact on the overall structural strength of the drive shaft 11 and is not conducive to the drive shaft 11 performing long-term operations under high strength.

[0104] In a second aspect, an embodiment of the present application provides a control system, which uses the handheld multi-mode electric pickaxe 100 in the above embodiment, and includes: a temperature sensor, which can be arranged inside the motor 1 or inside the accommodation box 3, and is used for collecting temperature information of the motor 1 or the environment around the motor 1; a driving member, which is used for driving the adjusting plate 35 to move between the open position and the closed position. The specific structure of the driving member has been described in detail in the above embodiment and will not be described in detail here; a central controller, which is electrically connected to the temperature sensor and the driving member. The central controller receives the temperature information of the motor 1 or the environment around the motor 1, and controls the driving member to drive the adjusting plate 35 to move between the open position and the closed position, so as to realize switching between the indirect cooling mode and the direct cooling mode for cooling the motor 1 according to the change of the temperature of the motor 1.

[0105] Exemplarily, if the drive rod 8 and the adjusting ring 4 in the above embodiment are both driven by a micro motor, the central controller can correspondingly control the up and down movement of the drive rod 8 in the duct 113 (for driving the seal 6 to switch between the retracted position and the deployed position) and control the rotation of the adjusting gear 43 to realize the rotation of the adjusting ring 4 in the annular plate 25 (realize controlling the communication or isolation between the second space 23 and the air supply chamber 21) according to the change of the temperature of the motor 1 or the environment around the motor 1.

[0106] The present application effectively realizes efficient cooling and dust-proof protection of the motor 1 by adopting a multi-level heat dissipation structure and an intelligent control method. The containing box 3 is isolated from the outside to form a closed heat dissipation cavity to effectively prevent direct dust intrusion. At the same time, multiple guide tubes 5 and flow channels 112 are arranged inside so that the cold air flow can quickly take away the heat generated by the motor 1 after heat exchange. The design of the inclined pipe section 51 and the straight pipe section 52 in the guide tube 5 not only reduces the structural size but also increases the heat exchange area, so that the requirements of low-temperature and low-noise operation can be met in the indirect heat dissipation mode. When the temperature of the motor 1 rises, the direct heat dissipation mode is realized by automatically opening the adjustment window, so that the cold air flow directly acts on the surface of the motor 1 to further accelerate the heat release. The design of the flow channel 112 arranged in the drive shaft 11 allows the cold air flow to directly reach the core area of ​​the motor, effectively reducing the temperature rise. At the same time, the seal 6 is used to close the opening at low temperature to prevent noise, and to expand and guide the cold air flow into the flow channel 112 at high temperature to achieve efficient heat exchange, effectively avoiding the automatic shutdown of the motor due to overheating, so that the entire electric tool exhibits excellent heat dissipation performance and dust-proof effect in long-term, high-load operation.

[0107] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A handheld multi-mode electric pick, comprising a motor (1), a transmission assembly (9) and an impact assembly (10), wherein the handheld multi-mode electric pick has a hammering mode and a hammer drilling mode, and is characterized in that: include: A housing (2), wherein the motor (1), the transmission assembly (9), and the impact assembly (10) are all accommodated in the housing (2); a containing box (3) disposed in the housing (2), the motor (1) being contained in the containing box (3), and in the radial direction of the motor (1), the outer periphery of the motor (1) and the inner side wall of the containing box (3) being spaced apart so that the space between the two forms a first space (34); A blade (115) is coaxially sleeved and fixed to the drive shaft (11) of the motor (1), and the blade (115) is spaced apart and located above the accommodating box (3) so that an air supply cavity (21) is formed between the blade (115) and the accommodating box (3); A flow guide tube (5) is arranged in the first space (34); the flow guide tube (5) is in plurality, and the plurality of flow guide tubes (5) are distributed in the first space (34) at intervals around the axial direction of the drive shaft (11); in the axial direction of the motor (1), one end of each of the flow guide tubes (5) is connected to the air supply chamber (21), and the other end is connected to the outside; A plurality of adjustment windows are provided, and the plurality of adjustment windows are spaced apart and distributed on the peripheral side wall of the containing box (3) around the driving shaft (11); the adjustment windows have an open position and a closed position, and when the adjustment windows are in the open position, the first space (34) is connected to the outside and the air supply cavity (21); when the adjustment windows are in the closed position, they are used to seal the containing box (3); and An air supply port (22) is provided on the side wall of the shell (2), and the air supply port (22) is located above the blade (115).

2. The handheld multi-mode electric pick according to claim 1, characterized in that: The accommodating box (3) comprises a top plate (31), and the driving shaft (11) passes through the top plate (31) from bottom to top; and A side plate (32) has one end connected to the bottom wall of the top plate (31) and the other end fixedly abutted against the bottom wall of the housing (2) in the axial direction of the motor (1).

3. The handheld multi-mode electric pick according to claim 2, characterized in that: The top plate (31) comprises a first sub-plate body (311), the first sub-plate body (311) being coaxially sleeved and fixed to the driving shaft (11); the upper end of each of the flow guide pipes (5) is connected to the first sub-plate body (311); and A second sub-plate body (312) is coaxially arranged on the outer side of the first sub-plate body (311), one end of the second sub-plate body (312) away from the first sub-plate body (311) is fixedly connected to the side plate (32), and one end of the second sub-plate body (312) close to the first sub-plate body (311) is rotatably connected to the circumference of the first sub-plate body (311); The containing box (3) further comprises a rotating ring (33), the rotating ring (33) being coaxially rotatably arranged on the bottom wall of the shell (2); in the axial direction of the motor (1), the rotating ring (33) penetrates the bottom wall of the shell (2), and the lower end of each of the air guide tubes (5) is connected to the rotating ring (33); a plurality of first air outlet holes (331) are penetrated on the rotating ring (33); The regulating window is arranged on the second sub-plate body (312) and / or the side plate (32).

4. The handheld multi-mode electric pick according to claim 3, characterized in that: The regulating window comprises a first hole (321) provided on the side plate (32), the first hole (321) passing through the side plate (32) in the radial direction of the motor (1), and the first hole (321) passing through the side plate (32) in the axial direction of the motor (1); and A second hole (3121) is provided on the second sub-plate body (312); in the radial direction of the motor (1), the second hole (3121) passes through the outer peripheral side of the second sub-plate body (312); in the axial direction of the motor (1), the second hole (3121) passes through the second sub-plate body (312); in the radial direction of the motor (1), the first hole (321) and the second hole (3121) correspond in position to each other, and form a first adjustment hole; The adjusting plate (35) is connected to the containing box (3) by being movable along the circumferential direction of the containing box (3), and the adjusting plate (35) has an open position and a closed position. The adjusting plate (35) is accommodated in the side plate (32) and the second sub-plate body (312), so that the adjusting plate (35) is in the open position and opens the first adjusting hole; the adjusting plate (35) is located in the first adjusting hole, so that the adjusting plate (35) is in the closed position and seals the first adjusting hole.

5. The handheld multi-mode electric pick according to claim 4, characterized in that: In the radial direction of the motor (1), the peripheral side of the sealing box is spaced apart from the inner wall of the shell (2), so that the space between the peripheral side of the sealing box and the inner wall of the shell (2) forms a second space (23) communicating with the air supply cavity (21); In the axial direction of the motor (1), a plurality of second air outlet holes (24) are provided through the bottom wall of the housing (2) corresponding to the second space (23).

6. The handheld multi-mode electric pick according to any one of claims 1 to 5, characterized in that: One end of the drive shaft (11) away from the blade (115) extends downwardly out of the housing (2); The peripheral side of the driving shaft (11) located in the air supply cavity (21) is provided with a plurality of openings (111), and the plurality of openings (111) are arranged at intervals around the axial direction of the motor (1); a flow channel (112) corresponding to the openings (111) is provided in the driving shaft (11), and the flow channel (112) extends along the axial direction of the motor (1); In the axial direction of the motor (1), the upper end of the flow channel (112) is connected to the opening (111), and the lower end of the flow channel (112) passes downward through the drive shaft (11).

7. The handheld multi-mode electric pick according to claim 6, characterized in that: The handheld multi-mode electric pick also includes a sealing member (6) movably arranged in the opening (111), and the sealing member (6) has an extended position and a retracted position; The sealing member (6) is in the deployed position, opening the opening (111) to introduce airflow into the opening (111) and into the flow channel (112); the sealing member (6) is in the retracted position to seal the opening; when the sealing member (6) is in the retracted position, the outer peripheral contour of the sealing member (6) matches the outer peripheral contour of the drive shaft (11).

8. The handheld multi-mode electric pick according to claim 7, characterized in that: The handheld multi-mode electric pick also includes a drive rod (8) coaxially arranged in the drive shaft (11), the lower end of the drive rod (8) at least partially protrudes from the drive shaft (11), and the lower end of the drive rod (8) is threadedly connected to the housing (2); and A second bearing (81), the inner ring of the second bearing (81) being sleeved and fixed on the outer periphery of the driving rod (8); A connecting rod (82) is provided, in the radial direction of the motor (1), with one end of the connecting rod (82) being rotatably mounted on the outer ring of the second bearing (81) and the other end being rotatably mounted on the sealing member (6); the driving rod (8) is rotated to drive the sealing member (6) to move between the extended position and the retracted position.

9. The handheld multi-mode electric pick according to claim 8, characterized in that: A hole (113) is coaxially provided in the driving shaft (11), and the driving rod (8) is movably arranged in the hole (113), and the driving rod (8) is a metal structural part; The driving rod (8) has a lumen (83) in it, and a liquid wick (84) is attached to the inner wall of the lumen (83), and a low-boiling-point liquid is stored in the liquid wick (84); an airway (831) is formed on the side of the liquid wick (84) away from the inner wall of the lumen (83), and the lumen (83) is in a vacuum environment; A heat exchange port (114) communicating with the hole (113) is provided on the peripheral side of the drive shaft (11) above the opening (111); in the axial direction of the motor (1), the heat exchange port (114) and the opening (111) are staggered.

10. A control system, using the handheld multi-mode electric pick as claimed in any one of claims 1 to 9, characterized in that: include: A temperature sensor is arranged in the motor (1) and is used to collect temperature information of the motor (1); A driving member, used for driving the adjustment plate (35) to move between the open position and the closed position; A central controller is electrically connected to the temperature sensor and the driving member, and the central controller receives temperature information of the motor (1) and controls the driving member to drive the adjustment plate (35) to move between the open position and the closed position.

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